My cat has been on Royal Canin's Renal Care pouches
for 7 years, due to a liver condition. I usually feed him in the morning before I leave for work, and there's always some left over in the bowl when I get home that I toss before washing the bowl and giving him more food. A few weeks ago, I noticed that when I got home from work, the food, which was not completely dried out, was magenta. On Tuesday and yesterday, the same thing happened. This has happened using two different bowls (one glass, one ceramic).
I called Royal Canin today, and they seemed dismissive, and just said that there has been no formula changes, and that the food has no artificial colors and color changes are to be expected once the food has been exposed to air. I tried to emphasize that the food was MAGENTA, and this had never happened before, but the CSR just repeated that color changes were to be expected.
Around the time of the first magenta-ing, I did notice that Miles didn't seem to be eating as much. I leave Innova Senior dry food out for both my cats all day, so he does have other food available.
In March of 2006, Royal Canin recalled this particular brand of cat food because of increased amounts of vitamin D, which caused hypercalcemia and caused poor Miles to lose about a third of his body weight in two months. Of course I did ask the CSR if there was any recall, and she assured me that there was not, but that explains why I'm a little bit panicky about this.
I do have a call in to my vet, but I don't know that Royal Canin will tell them anything different than they told me.